stc: move tests to variant; declare platforms any/noarch

Author: mascguy

devel/STC/Portfile

@@ -10,12 +10,17 @@ PortGroup           github 1.0
 # https://github.com/stclib/STC/issues/61
 github.setup        stclib STC 19501aacdcb9ed90618fd494e353d8ff65a4210c
 version             4.2
-revision            2
+revision            3
+
 categories          devel
+platforms           any
+supported_archs     noarch
 license             MIT
 maintainers         {mascguy @mascguy} {@barracuda156 gmail.com:vital.had} openmaintainer
+
 description         A modern, user-friendly, generic, type-safe and fast C99 container library
-long_description    {*}${description} featuring string, vector, sorted and unordered map and set, deque, forward list, smart pointers, bitset and random numbers.
+long_description    {*}${description} featuring string, vector, sorted and unordered map and set,\
+                    deque, forward list, smart pointers, bitset and random numbers.
 
 checksums           rmd160  524ee9078b45f9b4392d3322a0518c1516d77de4 \
                     sha256  30b96748a5e192366d95fa6d7090bdd4f895b4f5c2e633f082309a5273638bcf \
@@ -26,7 +31,7 @@ compiler.c_standard 1999
 cmake.set_c_standard yes
 
 configure.args-append \
-                    -DBUILD_TESTING=yes
+                    -DBUILD_TESTING=OFF
 
 # Needs support for atomic operations.
 # Re Xcode clang: https://github.com/stclib/STC/issues/62
@@ -45,5 +50,11 @@ destroot {
     xinstall -m 0644 -W ${worksrcpath} LICENSE README.md ${destroot}${docdir}
 }
 
-test.run            yes
-test.cmd            ctest
+variant tests description {Enable tests} {
+    configure.args-replace \
+                    -DBUILD_TESTING=OFF \
+                    -DBUILD_TESTING=ON
+
+    test.run        yes
+    test.cmd        ctest
+}